CN210430414U - Multichannel laser driving device and electronic equipment - Google Patents
Multichannel laser driving device and electronic equipment Download PDFInfo
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- CN210430414U CN210430414U CN201921744003.0U CN201921744003U CN210430414U CN 210430414 U CN210430414 U CN 210430414U CN 201921744003 U CN201921744003 U CN 201921744003U CN 210430414 U CN210430414 U CN 210430414U
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Abstract
The utility model provides a multichannel laser drive device and electronic equipment, multichannel laser drive device includes: the driving module comprises a front-stage driving unit and a rear-stage driving unit connected with the front-stage driving unit, and the rear-stage driving unit is provided with a driving signal output end; the laser diode array module comprises at least two laser diodes and is provided with a driving signal receiving end and at least two on-off signal receiving ends; the driving signal receiving end is connected with the driving signal output end; the on-off control module is provided with at least two on-off signal output ends, and the on-off signal output ends are connected with the on-off signal receiving ends in a one-to-one correspondence mode. The utility model discloses a design of a pair of many laser drive passageways has solved the problem that the power that current one-to-one and many-to-many passageway laser drive device exists is low, be difficult for integration, the structure is complicated and measurement of efficiency is low.
Description
Technical Field
The utility model belongs to multi-line laser application especially relates to a multichannel laser drive arrangement and electronic equipment.
Background
With the development of laser technology, the laser technology has wide application in the fields of laser ranging, laser radar, laser communication and the like. The single-channel Laser driving circuit is mainly applied in the market at present, the circuit modulates single-channel pulse, and then drives an LD (Laser Diode) to emit a Laser Diode after being amplified by the circuit, and the scheme has the defects of larger volume and difficult integration; the transmitting power is fixed, and the adjustable performance is poor; the application scene is narrow, and the compatibility is poor. Therefore, a design device of a multi-channel laser driver is needed in the application aspect of laser communication, and the multi-channel laser driver plays an important role in the laser application field, especially in the fields based on multi-line laser ranging and multi-line laser radar.
Therefore, how to provide a multi-channel laser driving device and an electronic apparatus to solve the defects of low power, difficult integration, complex structure, low measurement efficiency, and the like of the conventional laser driving has become a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a multi-channel laser driving device and an electronic device, which are used to solve the problem of low driving efficiency of one-to-one and many-to-many multi-channel laser driving devices in the prior art.
In order to achieve the above objects and other related objects, the present invention provides a multi-channel laser driving device, which includes: the driving module comprises a front-stage driving unit and a rear-stage driving unit connected with the front-stage driving unit, and the rear-stage driving unit is provided with a driving signal output end; the laser diode array module comprises at least two laser diodes and is provided with a driving signal receiving end and at least two on-off signal receiving ends; the driving signal receiving end is connected with the driving signal output end; the on-off control module is provided with at least two on-off signal output ends, and the on-off signal output ends are connected with the on-off signal receiving ends in a one-to-one correspondence manner; the laser diode main control module is respectively connected with the driving module and the on-off control module; when the driving module provides preset driving power for the laser diode array module, the on-off control module controls at least two laser diodes in the laser diode array module to conduct in a time-sharing mode.
In an embodiment of the present invention, the multi-channel laser driving apparatus further includes: the laser diode driving power supply module and the laser diode zero detection module; the laser diode main control module is provided with a detection end, a first output end, a second output end and a third output end; the detection end is connected with the laser diode zero detection module; the first output end is connected with the laser diode driving power supply module; the second output end is connected with the preceding stage driving unit; and the third output end is connected with the on-off control module.
In an embodiment of the present invention, the laser diode driving power module includes a Boost switch circuit unit, a peripheral circuit unit, and a closed loop unit; the input end of the Boost switch circuit unit is connected with the laser diode main control module, and the output end of the Boost switch circuit unit is connected with the input end of the peripheral circuit unit; the first output end of the peripheral circuit unit is connected with the input end of the closed loop unit, and the second output end of the peripheral circuit unit is connected with the rear-stage driving unit; and the output end of the closed loop unit is connected with the laser diode main control module.
In an embodiment of the present invention, the laser diode main control module is provided with a voltage collecting end, the voltage collecting end is connected to the output end of the closed loop unit.
In an embodiment of the present invention, the laser diode zero point detection module includes an amplifying unit and a comparing unit; the input end of the amplifying unit is connected with the laser diode array module, and the output end of the amplifying unit is connected with the input end of the comparing unit; and the output end of the comparison unit is connected with the detection end.
In an embodiment of the present invention, the laser diode main control module further includes a time difference detection unit, and the detection end is connected.
In an embodiment of the present invention, the laser diode array module employs at least two laser diodes, and is adjacent to the laser diodes, which are disposed in a predetermined angular distribution.
In an embodiment of the present invention, the preceding stage driving unit includes a differential comparison subunit and a preceding stage amplification subunit; the input end of the differential comparison subunit is connected with the second output end of the laser diode main control module, and the output end of the differential comparison subunit is connected with the input end of the preceding stage amplification subunit; and the output end of the preceding stage amplification subunit is connected with the rear stage driving unit.
Another aspect of the present invention provides an electronic device, including the multi-channel laser driving apparatus.
As described above, the multichannel laser driving device and the electronic device of the present invention have the following advantages:
the utility model discloses a Laser Diode zero point detection module has Laser zero signal detection function, can accurate real-time acquisition LD (Laser Diode ) upper end trigger signal when Laser emission; the laser time difference of flight timing processing is facilitated during laser ranging; the driving module is combined with the Laser Diode driving power supply module to have the characteristics of adjustable emission power and high compatibility, the Laser Diode is driven by adopting PWM narrow pulses, the emission power can be adjusted according to the pulse width, and meanwhile, the Laser Diode main control module can randomly adjust the driving voltage of the LD through the Laser Diode driving power supply module to achieve power adjustability and high compatibility. The Laser Diode array module has the characteristic of multi-channel LD (Laser Diode) driving, can simultaneously drive 16 pulse Laser diodes and is not interfered with each other; the utility model has the application characteristics of wide range, can be applied to the fields of laser ranging, laser radar, optical fiber communication, three-dimensional projection and the like, and has an important role in the aspects of laser three-dimensional projection and three-dimensional construction; the utility model discloses a design of one-to-many Laser drive passageway has solved the low power that current one-to-one and many-to-many passageway Laser drive device exists, difficult integration, the structure is complicated and measurement efficiency is low problem, has good compatibility on the one hand, can imbed each Laser drive system, on the other hand has the space-saving, characteristics such as reduce cost, adopt the conduction of the multiple LD (Laser Diode) of single channel simultaneous drive under the cooperation of LD (Laser Diode) control circuit to give out light; not only greatly reduces the space and the cost, but also improves the stability and the reliability of the product.
Drawings
Fig. 1 shows a topology connection diagram of the multi-channel laser driving device according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a multi-channel laser driving device according to an embodiment of the present invention.
Fig. 3 is an array connection diagram of the multi-channel laser driving device according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a control signal of the multi-channel laser driving device according to an embodiment of the present invention.
Description of the element reference numerals
1 laser diode master control module
11 first output terminal
12 second output terminal
13 third output terminal
14 detection terminal
15 time difference detection unit
16 voltage acquisition terminal
2 laser diode driving power supply module
21 Boost switch circuit unit
22 peripheral circuit unit
23 closed loop circuit unit
3 drive module
31 preceding stage drive unit
311 differential comparison subunit
312 preceding stage amplifier subunit
32 rear stage drive unit
4 on-off control module
5 laser diode zero detection module
51 comparing unit
52 amplification unit
6 laser diode array module
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic concept of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
The utility model provides a multichannel laser drive device and electronic equipment includes drive module, laser diode array module and on-off control module, works as drive module does when laser diode array module provides and predetermines drive power, on-off control module control two at least laser diode timesharing in the laser diode array module switch on. The utility model discloses a multichannel design has solved the problem that the power that current single channel laser drive device exists is low, difficult integrated, the structure is complicated and measurement of efficiency is low.
Example one
This embodiment provides a multichannel laser drive device, multichannel laser drive device includes:
the driving module comprises a front-stage driving unit and a rear-stage driving unit connected with the front-stage driving unit, and the rear-stage driving unit is provided with a driving signal output end;
the laser diode array module comprises at least two laser diodes and is provided with a driving signal receiving end and at least two on-off signal receiving ends; the driving signal receiving end is connected with the driving signal output end;
the on-off control module is provided with at least two on-off signal output ends, and the on-off signal output ends are connected with the on-off signal receiving ends in a one-to-one correspondence manner;
when the driving module provides preset driving power for the laser diode array module, the on-off control module controls at least two laser diodes in the laser diode array module to conduct in a time-sharing mode.
The multi-channel laser driving apparatus provided in the present embodiment will be described in detail with reference to the drawings.
Please refer to fig. 1, which shows a connection diagram of a topology structure of a multi-channel laser driving device according to an embodiment of the present invention. As shown in fig. 1, most of the existing laser diode driving fields are single-channel driving, in fig. 1, 1 represents a control end, 2 represents a laser diode receiving end, an a topology structure represents the driving of a single-channel laser diode in the prior art, and a B topology structure represents the multi-channel driving of the laser diode in which a plurality of control ends and a plurality of receiving ends are connected one by one in the prior art, the connection scheme of the C topology structure of the utility model is superior to the a topology structure and the B topology structure in the prior art, compared with the a topology structure, the driving mode is more flexible, and the driving efficiency is improved; compared with a B topological structure, the structure is simplified, the integration level is high, and the driving power and the test efficiency are obviously improved.
Please refer to fig. 2, which shows a schematic circuit connection diagram of the multi-channel laser driving device according to an embodiment of the present invention. As shown in fig. 2, the multi-channel laser driving device can be used in the technical field of photoelectric and multi-line laser ranging, and specifically includes: the device comprises a laser diode main control module 1, a laser diode driving power supply module 2, a driving module 3, an on-off control module 4, a laser diode zero detection module 5 and a laser diode array module 6.
The laser diode main control module 1 is provided with a first output end 11, a second output end 12, a third output end 13, a detection end 14, a time difference detection unit 15 and a voltage acquisition end 16. The detection end 14 is connected with the laser diode zero detection module 5; the first output end 11 is connected with the laser diode driving power supply module 2; the second output end 12 is connected with the preceding stage driving unit 31; the third output end 13 is connected with the on-off control module 4.
In practical application, the laser diode main control module 1 adopts a main control processing unit taking a high-speed MCU or an FPGA as a core, specifically, the main control system adopts a controller taking an embedded STM32Fx series chip as a core, the main frequency of the controller is up to 178Mhz, the controller has rich peripheral interfaces, a plurality of TDC time difference measuring units are hung outside the controller, and a plurality of paths of laser time difference signals can be measured simultaneously by matching with STM 32; the main control system can also adopt spartan6 series high-speed FPGA as a core device, and has strong logic resources inside, up to 400Mhz dominant frequency. Integrating the TDC time difference measuring unit in the FPGA by an internal logic gate and adopting a delay line technology; not only the technical security is enhanced, but also the data throughput is improved.
In the present embodiment, the laser diode master module 1 is used for generating multiple PWM signals, including PWM1, PWM2 and PWM 3. The PWM1 controls the laser diode driving power supply module 2 to generate an adjustable direct-current power supply, the PWM2 controls the front-stage driving unit 31 to drive and generate a high-speed stable pulse signal to drive a rear-stage circuit, and the PWM3 controls the on-off control module 4 to generate a certain phase time difference; the laser diode main control module 1 is also used for processing a trigger signal from the laser diode zero point detection module 5, and the signal is used for system acquisition or timing processing of the laser diode main control module 1.
The laser diode driving power supply module 2 comprises a Boost switch circuit unit 21, a peripheral circuit unit 22 and a closed loop circuit unit 23; the input end of the Boost switch circuit unit 21 is connected with the laser diode main control module 1, and the output end is connected with the input end of the peripheral circuit unit 22; a first output end of the peripheral circuit unit 22 is connected with an input end of the closed loop unit 23, and a second output end is connected with the rear-stage driving unit 32; the output end of the closed loop unit 23 is connected with the laser diode main control module 1.
In practical application, the laser diode driving power module 2 adopts an ultra-high-speed, low-impedance and high-current MOS or a switching tube as a core control device. The Boost switch circuit unit 21 is a Boost circuit, and utilizes the Boost circuit principle, and combines with peripheral devices to generate a 5-36V adjustable dc power supply, the driving current of which can reach 500mA at most, the input of which is connected with the PWM1 output port of the laser diode main control module 1, and the output voltage is adjusted according to the duty ratio of the input PWM1 signal to generate a stable dc power supply under the driving of the PWM1, so as to achieve the purpose of step adjustment. Specifically, the laser diode driving power supply module 2 uses a DC-DC conversion chip as a core device or a high-speed MOS switch tube as a core switch, and raises the low-voltage DC thereof by using the Boost circuit principle, for example, the core device uses MIC2288, and the core switch uses ZVN 4525.
Specifically, the peripheral circuit unit 22 includes energy storage inductors, energy storage capacitors, RC filters, and other devices, and performs current energy storage during boosting, and the output voltage is raised by using the principle that current and voltage cannot change suddenly; and meanwhile, the RC circuit performs power supply filtering on the output voltage, so that the output voltage is stable and the ripple is small.
Specifically, the output end of the closed loop unit 23 is connected to the voltage acquisition end 16 of the laser diode main control module 1. The voltage acquisition end 16 is a plurality of ADC analog signal acquisition ports and is used for acquiring voltage information on the laser diode driving power supply module 2, accurately judging the stable state of the power supply in real time, and implementing a stable closed-loop control loop. The voltage signal of the laser diode driving power supply module 2 can be fed back to the laser diode main control module 1 in real time through the closed loop unit 23, and the laser diode main control module 1 performs PWM (pulse width modulation) regulation according to the fed-back voltage information to keep the stability of the output voltage; the circuit output directly provides a stable driving voltage for the subsequent stage driving unit 32. The closed loop unit 23 is composed of a voltage follower and a divider resistor, the divider resistor divides the output power, and then transmits the divided power to the operational amplifier for amplification or isolated output, and the laser diode main control module 1 collects the voltage change in real time, for example, the voltage follower is MCP 601.
The driving module 3 comprises a front driving unit 31 and a rear driving unit 32 connected with the front driving unit 31, wherein the rear driving unit 32 is provided with a driving signal output end.
In the present embodiment, the front stage driving unit 31 includes a differential comparison subunit 311 and a front stage amplification subunit 312; the input end of the differential comparison subunit 311 is connected to the second output end 12 of the laser diode main control module 1, and the output end is connected to the input end of the preceding stage amplification subunit 312; the output of the pre-amplifier subunit 312 is connected to the post-driver unit 32.
In practical applications, the front-stage driving unit 31 is configured to buffer and amplify the PWM2 signal from the laser diode main control module 1, so as to improve the driving capability and provide a high-speed and reliable driving control signal for the rear-stage driving unit 32. The PWM2 signal is specifically a pair of complementary differential signals PWMP and PWMN, which are directly generated by the FPGA or high-speed MCU on the laser diode main control module 1, and the pulse width thereof is usually 5-200 ns, and the specific size is determined by the application requirements. The signal is converted into a single-ended TTL signal through the differential comparison subunit 311, and the output of the single-ended TTL signal is connected to the input of the preceding stage amplification subunit 312, so that the signal is further amplified directly. The differential mode input can eliminate high-frequency oscillation generated by single PWM driving, can effectively improve the rising edge driving speed, and can effectively improve the LD (Laser Diode) driving efficiency in practical application.
In practical application, the rear driving unit 32 cooperates with the front driving unit 31 to further drive the laser diodes in the laser diode array module 6, the laser diode driving power supply module 2 provides a voltage source with continuous source, stability and high efficiency for the rear driving unit 32, and the driving power control of the laser diode array module 6 is realized under the control of the narrow pulse signal of the front driving unit 31.
Specifically, the rear stage driving unit 32 includes a high speed MOS transistor or a switching transistor. For example, an integrated MOS-driven bridge driver chip MIC4452 is adopted, or a high-speed and high-current NMOS BSZ165N04 is adopted as a core driver, and the MOS transistor or the switching transistor has the characteristics of ultra-low impedance, switching speed as low as 5ns, working voltage as high as 60V, driving current as high as 30A, small volume, low cost and the like.
The on-off control module 4 is provided with at least two on-off signal output ends, and the on-off signal output ends are connected with the on-off signal receiving ends in a one-to-one correspondence mode.
In practical applications, please refer to fig. 3, which shows an array connection diagram of the multi-channel laser driving device according to an embodiment of the present invention. As shown in fig. 3, the on-off control module 4 and the laser diode array module 6 are tightly combined and connected in a one-to-one correspondence manner.
Specifically, G1 … Gn is obtained by modulating according to the PWM3 signal output by the third output terminal 13 of the laser diode main control module 1, and G1 … Gn is transmitted to the same on-off control module 4. In fig. 3, PWM is represented as PWM3 modulation signal, the PWM pulse high level width is Tz1, the phase difference time between each path of the modulation signal is ta, the phase difference time between each path of the modulation signal and the PWM pulse edge is ts, the pulse high level width is Tz2, and the frequency of each path is PWM/n; l1 … Ln is the cathode terminal of each laser diode on the array diode.
In practical applications, the on-off control module 4 includes a plurality of logic controllers or a plurality of high-speed devices, and the high-speed devices adopt switching tubes or MOS tubes with ultra-high speed, low impedance and high current, for example, the MOS tubes BSZ065N03 or BSZ165N04NS are used as core switches. The on-off control module 4 is used for realizing high-speed on-off of a plurality of Laser diodes, the on-off control module 4 mainly comprises 2-N groups of LD (Laser Diode) control circuits, the specific number is determined by the number of Laser emitting tubes, the control circuits are used for controlling the high-speed on-off of a single LD (Laser Diode), and a certain phase time difference is generated between each group of LD (Laser Diode) control circuits, so that a plurality of Laser diodes on the Laser Diode array module 6 continuously emit Laser signals in turn without mutual interference, and therefore, the time-sharing conduction of the plurality of Laser diodes is realized under the matching of a plurality of groups of LD (Laser Diode) control circuits.
Specifically, the PWM signal output by the front-stage driving unit 31 is added to the rear-stage driving unit 32, the output of the PWM signal is directly connected to an LD (Laser Diode) anode of the Laser Diode array module 6, and provides a continuous driving pulse for the LD (Laser Diode) anode of the Laser Diode array module 6, and a plurality of LD (Laser Diode) cathodes of the Laser Diode array module 6 are respectively and correspondingly connected to the output end of the on-off control module 4; the change of the output signal of each path of LD (Laser Diode) control circuit is controlled by changing the input signal of the LD (Laser Diode) control circuit of the on-off control module 4, thereby realizing the on-off of each LD (Laser Diode).
Further, the rear-stage driving unit 32 cooperates with the laser diode array module 6 and the on-off control module 4, and the three parts can be combined into a laser emitting unit, which is mainly used for completing the continuous emission of multiple laser diodes. The Laser Diode main control module 1 generates a narrow pulse signal of 60-320 khz, the narrow pulse signal is input to a Laser emission unit, enters a circuit for further signal amplification after being buffered and amplified by a preceding-stage circuit, and can provide continuous high-voltage and high-current drive for a plurality of LD (Laser Diode); the driving of the excitation and circuit of the narrow pulse greatly increases the emitting efficiency of LD (Laser Diode). The Laser Diode (LD) control circuit of the Laser emission unit performs switching on and off of a single LD, for example, when the system adopts three Laser emission paths, the Laser Diode main control module 1 outputs a narrow pulse signal of 60khz, and the frequency of each Laser Diode path is one third of the output frequency of the FPGA by the cooperation of the LD control circuit.
Specifically, please refer to fig. 4, which shows a schematic diagram of a control signal of the multi-channel laser driving apparatus according to an embodiment of the present invention. As shown in fig. 4, for example, the multi-channel Laser driving apparatus drives 3 Laser diodes, the PWM2 generates the same control signal for the anodes of the 3 LDs (Laser diodes), under the control of G1 … G3, if the system uses three-way Laser emission, the main control system will output a narrow pulse signal of 60khz, and under the cooperation of the LD (Laser Diode) control circuit, the frequency of the signal received by the cathode of each Laser Diode is one third of the output frequency of the Laser Diode main control module 1. Wherein Ts represents the phase difference time difference between the signal for controlling Gn and the wave generated by PWM; ta represents a phase difference between the control signal Gn and the adjacent signal Gn _ 1; tz1 represents the high level time of the PWM generated wave; tz2 represents a high level time of the generated control signal Gn.
It should be noted that, in order to meet the application and time-sharing conduction of different numbers of laser diodes, port expansion can be performed through at least one on-off control module 4 to control the on-off states of more than 16 laser diodes.
The laser diode zero detection module 5 comprises a comparison unit 51 and an amplification unit 52; the input end of the amplifying unit 52 is connected with the laser diode array module 6, and the output end is connected with the input end of the comparing unit 51; the output of the comparison unit 51 is connected to the detection terminal 14.
Specifically, the laser diode zero detection module 5 is composed of a high-speed amplifier and a high-speed comparator, and is configured to amplify and convert a current signal from the laser diode array module 6 into a voltage signal, shape the voltage signal into a TTL level signal recognizable by the laser diode main control module 1 by the high-speed comparator, and receive the TTL level signal by the detection terminal 14.
In this embodiment, the detection terminal 14 is connected to the time difference detection unit 15 of the laser diode main control module 1.
In practical application, the time difference detecting unit 15 is a plurality of TDC time difference measuring units, and the units mainly can quickly and accurately detect TTL level signals input by the laser diode zero point detecting module 5, and the TTL level signals are used to trigger system timing or system detection.
The laser diode array module 6 comprises at least two laser diodes and is provided with a driving signal receiving end and at least two on-off signal receiving ends; the driving signal receiving end is connected with the driving signal output end.
In this embodiment, the laser diode array module employs at least two laser diodes, and the adjacent laser diodes are distributed at a preset angle.
It should be noted that the packaging form of the laser diode may be a patch type, a direct insertion type, or other packaging forms of the laser diode that can meet the requirement of preset angle distribution.
Specifically, the Laser Diode array module 6 is composed of 2 to 16 SMD chip type pulse Laser diodes, the Laser diodes are arranged at a certain acute angle from top to bottom, the view field angle, that is, the angle between two LDs (Laser diodes) at the upper and lower edges is maximally 30 degrees, the central angle is 0 degree, the view field arrangement of the upper and lower plus and minus 15 degrees is performed, and the resolution of each two adjacent angles is 1 to 10 degrees according to the number of the Laser diodes.
It should be noted that, in order to meet the application and time-sharing conduction of different numbers of laser diodes, the number of laser diodes can be expanded through at least one laser diode array module 6, so as to implement time-sharing conduction of more than 16 laser diodes.
The multichannel laser drive device that this embodiment provided has solved the problem that the power that current single channel laser drive device exists is low, difficult integration, the structure is complicated and measurement of efficiency is low.
Example two
The embodiment provides an electronic device comprising the multi-channel laser driving device.
In this embodiment, the multi-channel laser driving apparatus includes: the device comprises a laser diode main control module, a laser diode driving power supply module, a driving module, an on-off control module, a laser diode zero detection module and a laser diode array module.
The laser diode main control module is provided with a detection end, a first output end, a second output end and a third output end; the detection end is connected with the laser diode zero detection module; the first output end is connected with the laser diode driving power supply module; the second output end is connected with the preceding stage driving unit; and the third output end is connected with the on-off control module.
The laser diode driving power supply module comprises a Boost switch circuit unit, a peripheral circuit unit and a closed loop unit; the input end of the Boost switch circuit unit is connected with the laser diode main control module, and the output end of the Boost switch circuit unit is connected with the input end of the peripheral circuit unit; the first output end of the peripheral circuit unit is connected with the input end of the closed loop unit, and the second output end of the peripheral circuit unit is connected with the rear-stage driving unit; and the output end of the closed loop unit is connected with the laser diode main control module. The laser diode main control module is provided with a voltage acquisition end, and the voltage acquisition end is connected with the output end of the closed loop unit.
The driving module comprises a front-stage driving unit and a rear-stage driving unit connected with the front-stage driving unit, and the rear-stage driving unit is provided with a driving signal output end. The preceding stage driving unit comprises a differential comparison subunit and a preceding stage amplification subunit; the input end of the differential comparison subunit is connected with the second output end of the laser diode main control module, and the output end of the differential comparison subunit is connected with the input end of the preceding stage amplification subunit; and the output end of the preceding stage amplification subunit is connected with the rear stage driving unit.
The on-off control module is provided with at least two on-off signal output ends, and the on-off signal output ends are connected with the on-off signal receiving ends in a one-to-one correspondence mode.
The laser diode zero detection module comprises an amplifying unit and a comparing unit; the input end of the amplifying unit is connected with the laser diode array module, and the output end of the amplifying unit is connected with the input end of the comparing unit; and the output end of the comparison unit is connected with the detection end. The laser diode main control module further comprises a time difference detection unit which is connected with the detection end.
The laser diode array module comprises at least two laser diodes and is provided with a driving signal receiving end and at least two on-off signal receiving ends; the driving signal receiving end is connected with the driving signal output end. The laser diodes adjacent to the laser diode array module are distributed at a preset angle.
In practical application, the working process of the electronic device is as follows: and controlling and driving a rear-stage circuit through three PWM (pulse-width modulation) paths of PWM1, PWM2 and PWM3 generated by the laser diode master control module. Specifically, the PWM1 outputs a certain PWM signal to control an LD (Laser Diode) driving power supply of the Laser Diode driving power supply module, and the voltage output by the LD (Laser Diode) driving power supply can be rapidly adjusted according to the size of the PWM1, so as to provide driving voltages required under different models and different powers for the multi-channel Laser driver; the high-speed narrow pulse of PWM2 is amplified by the front-stage driving unit, so that the amplified signal is transmitted to the rear-stage driving unit to drive an LD (Laser Diode) anode of the Laser Diode array module; the PWM3 signal drives a plurality of LD (Laser Diode) cathodes of the Laser Diode array module through input to the on-off control module to control on and off of a plurality of Laser diodes in the Laser Diode array module, and thus the electronic device realizes high-speed on and off of a plurality of Laser diodes under the action of the PWM 3. The Laser Diode zero detection module accurately detects the conduction state of each LD (Laser Diode) of the Laser Diode array module in real time and captures a start signal fed back when the LD (Laser Diode) emits light in real time.
To sum up, multichannel laser drive arrangement and electronic equipment have multichannel driven characteristics, can drive 16 or more pulse laser diode and mutual noninterference simultaneously, have important effect in the aspect of laser three-dimensional projection and three-dimensional construction, not only significantly reduce in space and cost, more can improve the stability and the reliability of product. The utility model discloses effectively overcome all kinds of shortcomings in the prior art and had high industry value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A multi-channel laser driving apparatus, comprising:
the driving module comprises a front-stage driving unit and a rear-stage driving unit connected with the front-stage driving unit, and the rear-stage driving unit is provided with a driving signal output end;
the laser diode array module comprises at least two laser diodes and is provided with a driving signal receiving end and at least two on-off signal receiving ends; the driving signal receiving end is connected with the driving signal output end;
the on-off control module is provided with at least two on-off signal output ends, and the on-off signal output ends are connected with the on-off signal receiving ends in a one-to-one correspondence manner;
the laser diode main control module is respectively connected with the driving module and the on-off control module;
when the driving module provides preset driving power for the laser diode array module, the on-off control module controls at least two laser diodes in the laser diode array module to conduct in a time-sharing mode.
2. The multi-channel laser driving device as claimed in claim 1, further comprising: the laser diode driving power supply module and the laser diode zero detection module;
the laser diode main control module is provided with a detection end, a first output end, a second output end and a third output end;
the detection end is connected with the laser diode zero detection module;
the first output end is connected with the laser diode driving power supply module;
the second output end is connected with the preceding stage driving unit;
and the third output end is connected with the on-off control module.
3. The multi-channel laser driving device according to claim 2,
the laser diode driving power supply module comprises a Boost switch circuit unit, a peripheral circuit unit and a closed loop unit;
the input end of the Boost switch circuit unit is connected with the laser diode main control module, and the output end of the Boost switch circuit unit is connected with the input end of the peripheral circuit unit;
the first output end of the peripheral circuit unit is connected with the input end of the closed loop unit, and the second output end of the peripheral circuit unit is connected with the rear-stage driving unit;
and the output end of the closed loop unit is connected with the laser diode main control module.
4. The multi-channel laser driving device according to claim 3,
the laser diode main control module is provided with a voltage acquisition end, and the voltage acquisition end is connected with the output end of the closed loop unit.
5. The multi-channel laser driving device according to claim 2,
the laser diode zero detection module comprises an amplifying unit and a comparing unit;
the input end of the amplifying unit is connected with the laser diode array module, and the output end of the amplifying unit is connected with the input end of the comparing unit;
and the output end of the comparison unit is connected with the detection end.
6. The multi-channel laser driving device according to claim 5,
the laser diode main control module further comprises a time difference detection unit which is connected with the detection end.
7. The multi-channel laser driving device according to claim 1,
the laser diode array module adopts at least two laser diodes, and the adjacent laser diodes are distributed at a preset angle.
8. The multi-channel laser driving device according to claim 1,
the preceding stage driving unit comprises a differential comparison subunit and a preceding stage amplification subunit;
the input end of the differential comparison subunit is connected with the second output end of the laser diode main control module, and the output end of the differential comparison subunit is connected with the input end of the preceding stage amplification subunit;
and the output end of the preceding stage amplification subunit is connected with the rear stage driving unit.
9. An electronic device comprising the multi-channel laser driving apparatus of claims 1 to 8.
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| CN201921744003.0U CN210430414U (en) | 2019-10-17 | 2019-10-17 | Multichannel laser driving device and electronic equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098978A (en) * | 2020-09-14 | 2020-12-18 | 哈工大机器人（合肥）国际创新研究院 | System and method for improving on-state speed of TOF camera laser and reducing driving power consumption |
| CN112596044A (en) * | 2020-11-20 | 2021-04-02 | 上海禾赛科技股份有限公司 | Receiving device, laser radar and method for reducing interference signals of laser radar receiving device |
| CN114137558A (en) * | 2022-02-07 | 2022-03-04 | 杭州宏景智驾科技有限公司 | Control method and device for improving laser radar precision and laser radar system |
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2019
- 2019-10-17 CN CN201921744003.0U patent/CN210430414U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098978A (en) * | 2020-09-14 | 2020-12-18 | 哈工大机器人（合肥）国际创新研究院 | System and method for improving on-state speed of TOF camera laser and reducing driving power consumption |
| CN112098978B (en) * | 2020-09-14 | 2024-03-26 | 哈工大机器人（合肥）国际创新研究院 | System and method for improving turn-on speed of TOF camera laser and reducing driving power consumption |
| CN112596044A (en) * | 2020-11-20 | 2021-04-02 | 上海禾赛科技股份有限公司 | Receiving device, laser radar and method for reducing interference signals of laser radar receiving device |
| CN114137558A (en) * | 2022-02-07 | 2022-03-04 | 杭州宏景智驾科技有限公司 | Control method and device for improving laser radar precision and laser radar system |
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